Although jail time is no longer a threat for Zimmerman, his lawyer says he fears for his life and may have to remain in hiding. He also potentially faces civil suits, which could result in hundreds of thousands of dollars in legal fees and cause possible financial ruin.

In criminal cases, the prosecution has to prove beyond a reasonable doubt that the defendant is guilty, and in most jurisdictions the jury's decision has to be unanimous. But in a civil case, the standard of proof is lower: The plaintiff's burden is, in essence, "more likely than not," rather than proof beyond a reasonable doubt.

According to Benjamin Crump, the attorney for Trayvon Martin's family, the parents of the slain teenager are considering additional legal options, including whether to sue Zimmerman in civil court.

"They are certainly going to look at that as an option," Crump said on ABC's "This Week." "They deeply want a sense of justice. They deeply don't want their son's death to be in vain."

The Orlando Sentinel reported in April that Martin's parents had settled a wrongful-death claim against the homeowners association of the Sanford, Fla., subdivision where their son was killed.

Zimmerman, 29, was accused of second degree murder for shooting Martin, 17, on Feb. 26, 2012 inside the gated community. While he admitted to shooting the unarmed teenager, Zimmerman maintained the teen attacked him and he acted in self defense.

The case quickly developed racial overtones when Sanford law enforcement declined to arrest Zimmerman. Zimmerman is white and Hispanic and Martin was black. Zimmerman was arrested nearly two months after the incident when the state appointed Angela Corey as a special prosecutor and she brought second degree murder charges against him.

A jury made up of six women found Zimmerman not guilty of both second-degree murder and manslaughter charges Saturday, after deliberating for more than 16 hours over two days.

"As you look at this case, you have what took place in the court, which had to deal with the law, but the court of public opinion is where this thing is exploded," ABC News Chief Investigative correspondent Pierre Thomas said on ABC's "This Week." "The bar is extremely high, but the Justice Department will be under intense pressure by the civil rights community to do something."

The National Association for the Advancement of Colored People (NAACP) released a statement shortly after the verdict was announced, calling on the Justice Department and Attorney General Eric Holder to take action after Zimmerman was found not guilty by a Florida jury.

"Today, justice failed Trayvon Martin and his family," said Roslyn M. Brock, Chairman of the NAACP. "We call immediately for the Justice Department to conduct an investigation into the civil rights violations committed against Trayvon Martin. This case has re-energized the movement to end racial profiling in the United States."

An NAACP petition calling for a federal prosecution of Zimmerman has collected more than 350,000 signatures -- some 225,000 on the NAACP site and another 130,000 where it was posted online in the NAACP's partnership with MoveOn.org.

The U.S. Justice Department has been conducting its own investigation into whether the shooting was motivated by racial pretense, meaning Zimmerman could be charged with a federal hate crime even though he was acquitted in state court, and could also take Zimmerman to trial.

The DOJ released a statement post-verdict saying their investigation was ongoing.

"The department continues to evaluate the evidence generated during the federal investigation, as well as the evidence and testimony from the state trial," a spokesman for the U.S. Department of Justice said in a statement Saturday.

Zimmerman's attorney Mark O'Mara told reporters at a press conference Saturday that his client will now focus on getting his life back.

"This verdict still has nothing to do with civil rights. Civil rights has to be talked about, but not in relation to George Zimmerman," O'Mara said about the trial's effect on race relations. "This is a tragedy but not one that Zimmerman is responsible for."

But O'Mara told ABC News that Zimmerman continues to fear for his safety. He is still wearing a bulletproof vest and he may still have to live in hiding.

If a civil case is brought against Zimmerman, "Nightline" anchor and ABC's Chief Legal Affairs anchor Dan Abrams said that, in Florida, his defense team can make a motion to have a civil case dismissed under the "Stand Your Ground" law. It states that a person whose self defense claim is found lawful "is immune from criminal prosecution and civil action for the use of such self defense."

In April, Zimmerman's defense team chose to waive the pre-trial Stand Your Ground hearing, and put their case before a jury. The hearing would have given the judge the discretion to free Zimmerman, eliminating the need for a trial. But the validity of a Stand Your Ground defense would be determined solely by a judge.

If Zimmerman were given immunity from a civil suit under the "Stand Your Ground" law, Abrams said, the defense might be able to win "reasonable attorney's fees, court costs, compensation for loss of income, and all expenses incurred in defense of any civil action brought by a plaintiff," according to Florida law.

Martin's family might be reluctant to file a civil suit, Abrams added, because they may decide it is not worth the emotional cost or they might fear that they could wind up owing Zimmerman money, if he is deemed to have "stood his ground" under the Florida law.

For defendants in high-profile murder cases, starting over after a not-guilty verdict can be extremely difficult. Casey Anthony, who acquitted of killing her daughter Caylee in 2011, still faces two civil defamation lawsuits.

She has been unemployed for four years and in hiding since her trial ended in 2011. She was the victim of a barrage of threats and was dubbed the most hated woman in America. Aside from a few stray photos, Anthony has succeeded in staying out of sight.

Jose Baez, Anthony's defense attorney, said on "Good Morning America" this morning that like Anthony, Zimmerman "won't be able to live a normal life ever again."

"They are forever etched in history and they will have to go and live quiet lives somewhere and try to do something with their lives," Baez said.

Last week, attorney Allan Watkins told ABCNews.com that Anthony was borrowing money from a friend to make a $25,000 payment that will settle $800,000 worth of debts Anthony owes to lawyers and other creditors in legal fees.

O.J. Simpson was acquitted of murder in the deaths of his ex-wife Nicole Brown Simpson and her friend Ronald Goldman in 1995, but then had to shell out millions in wrongful death civil suits brought forth by the victims' families. Then on Oct. 3, 2008, Simpson was convicted on armed robbery and kidnapping charges in an incident in which he claimed he was trying to get back sports memorabilia that had been taken from him, and was sentenced to nine to 33 years in prison.

Simpson has been serving his sentence at Lovelock Correctional Center in northern Nevada. A parole hearing is scheduled for July 25.